//! Pipes — transform / validate a single value before it reaches the handler (NestJS `PipeTransform`).
/// Transform one value into another, possibly failing (validation / coercion).
///
/// Use from handlers by calling [`PipeTransform::transform`] on a unit struct (or stateful pipe
/// type registered in DI). Route-level `#[use_pipes]` integration is not required for this trait to
/// be useful.